I recommend to use CallMeBot API to make Telegram Phone Calls (ringing your phone and reading the message that you want with TTS).
It is free and easy to use. No Account/Registration/Bot is required. Only using the CallMeBot API.
Have a look here:
https://community.openhab.org/t/openhab-can-make-telegram-phone-calls-now-with-tts-voice/
I use it for urgent notifications and it is working very well.